Improvement in glass-shaping machines



O. P. JACKSON & T. J. MGTIGHE.

Glass-Shaping Machine.

No. 222,790. Patented Dec. 2-3, 1879.

fi e 72 21;

NYPETERS, PNOTO LITHOGRAPHER WASNlNGTON. D Cv UNITED STATES PATENT @FFIGE.

OLIVER P. JACKSON AND THOMAS J. MCTIGHE, OF P ITTSBURG, PENNSYL- VANIA; SAID JACKSON ASSIGNOR TO WM. I. MILLER, (9F SAME PLACE.

IMPROVEMENT IN GLASS-SHAPING MACHINES.

Specification forming part of Letters Patent No. 222,790, dated December 23, 1879 application filed July 18, 1879.

To all whom it may concern:

'Be it known that we, OLIVER P. JACKSON and THOMAS J. MCTIGHE, of Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Glass-Shaping Machines; and we do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the-art to which it pertains to make and use it, reference being had to the accompanying drawings, which form part of this specification, in which Figure 1 is a side elevation of the machine when ready for operation, .broken lines repre senting another position. Fig. 2 is a section on line as mof Fig. 1.

This invention relates to machinery to be employed in expanding the mouths of glass bulbs, such as are blown in the process of making lamp-chimneys, globes, and kindred articles.

It consists, broadly, of two or more sliding arms, converging to a common point, and then continuing parallel to the common axis for a suitable distance, in combination with means for causing said arms to recede backwardly from eachother While the arms or article under manipulation are given motion in a circular direction.

It consists, further, in the mechanism hereinafter more fully described and claimed.

Referring to the drawings, A designates a shaft, to which is given motion, either rotary or oscillatory, and is provided with the groove a, by means of which and a suitable spline a collar, B, may be caused to travel to and fro on said shaft while in motion. This travel is effected by the bifurcated arm 0, which is attached to a slide-rod, D, passing through bearings b b, and actuated by a knee-block or othersuitable means. Collar B has projecting lugs c, as shown.

To the shaft A are fixed, so as to receive its motion, two heads, E, having the caps 61, as shown. In the spaces left between the caps d and heads E are inserted the arms F, theheads being so proportioned, as to diameter and dis tance apart, that when so placed the arms converge and meet at the axial prolongation of the shaft A. Here they continue parallel to the axis for a suitable distance. At points between f the bearings E the pitmen' G are pivoted to the arms F, as shown, and at their other ends these pitmen are pivoted to the lugs c of collar B. Thus arranged, any backward movement of collar B causes the pitinen or links G to pull on the arms F, which thus receive motion backwardly in the direction of theirlength, and the parallel portions of these arms expand in an angular direction while still remaining parallel, as indicated by directive arrows in Fig. 1.

The application of the machine to the purpose of opening the bottom of achimney-bulb and finishing it is exhibited in Fig. 1. The blower manipulates the pontil till he has given the bulb the proper shape, then draws out the end, creases it, and knocks off the horn thus formed, leaving the bulb with a hole at its lower end. He then reheats it in order to soften the end to be operated upon, and while the machine is revolving or oscillating he presents the bulb so that the closed tools F enter the hole as far as the rear end of their parallel portions. He then operates the rod D so as to give the tools or arms F the peculiar expanding movement before described. The effeet is to gradually and easily expand and draw out the lower portion of the bulb till it assumes the form shown by dotted lines. Then the rod D is released, and, controlled by a retractile spring or weight, the arms close together to their normal position and the bulb is withdrawn.

The action on the glass is peculiar. If the motion of the arms be analyzed it is found to be the resultant of two forces--one perpendicular to the axis, which is the expanding force, and the other parallel to the axis, which exerts on the interior of the bulb the well-known wiping-down action. The result is a very perfect shaping of the bulb.

We claim as our invention 1. In a machine for shaping glass bulbs, a

toolcomposed of two or more arms converging said arms apart in tliedireetion of theirlength, and suitable means for giving said arms motion in a circular direction.

In testimony that we claim the foregoing we have hereunto set our hands.

OLIVER P. JACKSON.

THOMAS J. MOTIGHE.

l Vitnesses J. J. McOoRmcK, LEDLIE GLONINGER. 

